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Phenotypic Polarization of Macrophages in Atherosclerosis

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TLDR
A novel view of the function of macrophages in the development of atherosclerosis that suggests dynamic plasticity is suggested and revealing the functional characteristics of individual macrophage phenotypes will lead to a better understanding of their contribution to lesion development and plaque stability.
Abstract
Macrophages orchestrate the inflammatory response in inflamed tissues, and recent work indicates that these cells can alter their phenotypes and functions accordingly in response to changes in the microenvironment. Initial work in models of cardiovascular disease used immunologic markers to characterize macrophage phenotypes present in atherosclerotic plaque, and these studies have lately been extended through the use of markers that are more specific for atherosclerosis and metabolic disease. Together, these studies have led to a novel view of the function of macrophages in the development of atherosclerosis that suggests dynamic plasticity. Understanding this plasticity and the ensuing macrophage heterogeneity could lead to novel strategies of pharmacological intervention to combat chronic inflammation in metabolic diseases. Most importantly, revealing the functional characteristics of individual macrophage phenotypes will lead to a better understanding of their contribution to lesion development and plaque stability.

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Journal ArticleDOI

Mechanisms of Plaque Formation and Rupture

TL;DR: Mechanisms of atherosclerotic plaque initiation and progression; how plaques suddenly precipitate life-threatening thrombi; and the concepts of plaque burden, activity, and vulnerability are discussed.
Journal ArticleDOI

Macrophage Polarization: Different Gene Signatures in M1(LPS+) vs. Classically and M2(LPS-) vs. Alternatively Activated Macrophages.

TL;DR: This fundamental discrepancy explains why most surface markers identified on in vitro generated macrophages do not translate to the in vivo situation and is justified by comparing the gene lists positively or negatively correlated with the ratio of IL-12 and arginase 1 in transcriptomes of LPS-treated peritoneal macrophades.
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Cytokines in atherosclerosis: Key players in all stages of disease and promising therapeutic targets.

TL;DR: The current understanding of the roles of different cytokines in atherosclerosis together with therapeutic approaches aimed at manipulating their actions are described.
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The Role of Macrophage Polarization in Infectious and Inflammatory Diseases

TL;DR: The current understanding of the contributions of differentially polarized macrophages to various infectious and inflammatory diseases and the ongoing effort to develop novel therapies that target this key aspect of macrophage biology are summarized.
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MicroRNA-containing microvesicles regulating inflammation in association with atherosclerotic disease

TL;DR: The role of microvesicles in cell-to-cell communication in general and in specific interactions between cells in chronic inflammation associated with atherosclerotic disease is discussed and changes in microRNA content rather than protein or lipid content are emphasized.
References
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Journal ArticleDOI

Alternative Activation of Macrophages: Mechanism and Functions

TL;DR: In this paper, the authors assess recent research in this field, argue for a restricted definition, and explore pathways by which the T helper 2 (Th2) cell cytokines interleukin-4 (IL-4) and IL-13 mediate their effects on macrophage cell biology, their biosynthesis, and responses to a normal and pathological microenvironment.
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Atherosclerosis: The Road Ahead

TL;DR: Elevated levels of serum cholesterol are probably unique through the hepatic LDL receptor pathway, as evi-in being sufficient to drive the development of athero-denced by the fact that lack of functional LDL receptors sclerosis in humans and experimental animals, even in is responsible for the massive accumulation of LDL in the absence of other known risk factors.
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Macrophages in the pathogenesis of atherosclerosis.

TL;DR: The central roles of macrophages in each of the stages of disease pathogenesis are discussed, including atherosclerosis, stroke, and sudden cardiac death.
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Macrophage-specific PPARγ controls alternative activation and improves insulin resistance

TL;DR: It is shown that mice with macrophage-specific deletion of the peroxisome proliferator activated receptor-γ (PPARγ) are required for maturation of alternatively activated macrophages, and gene expression profiling revealed that downregulation of oxidative phosphorylation gene expression in skeletal muscle and liver leads to decreased insulin sensitivity in these tissues.
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